Diagrammatic view of the fundus of the right internal acoustic meatus. (Testut.) 1. Crista falciformis. 2. Area facialis, with (2) internal opening of the facial canal. 3. Ridge separating the area facialis from the area cribrosa superior. 4. Area cribrosa superior, with (4) openings for nerve filaments. 5. Anterior inferior cribriform area, with (5) the tractus spiralis foraminosus, and (5) the canalis centralis of the cochlea. 6. Ridge separating the tractus spiralis foraminosus from the area cribrosa media. 7. Area cribrosa media, with (7) orifices for nerves to saccule. 8. Foramen singulare.